CN112123881B - Peep-proof membrane and preparation method thereof - Google Patents

Peep-proof membrane and preparation method thereof Download PDF

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CN112123881B
CN112123881B CN202011064087.0A CN202011064087A CN112123881B CN 112123881 B CN112123881 B CN 112123881B CN 202011064087 A CN202011064087 A CN 202011064087A CN 112123881 B CN112123881 B CN 112123881B
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light
peep
proof
transmitting
film
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CN112123881A (en
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文弘南
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Dongguan Mien Electronic Industry Co.,Ltd.
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Shenzhen Keyinx Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2333/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract

The invention provides a peep-proof film and a preparation method thereof, wherein the peep-proof film comprises a peep-proof base film and a light transmission treatment layer, and the light transmission treatment layer is positioned above the surface of the peep-proof base film; the peep-proof base film comprises a base material layer, a plurality of peep-proof units and light transmission units are arranged on the base material layer, and the peep-proof units and the light transmission units are sequentially and alternately arranged to form a shutter structure; the light-transmitting treatment layer is a light-transmitting film layer containing transparent filler particles. By adopting the technical scheme, the Moire pattern phenomenon and the wire drawing pattern phenomenon generated after the peep-proof film is attached to the display screen are eliminated, and the light transmittance is improved by 3-10%, so that the seen display screen has high definition and a better peep-proof effect; the preparation method is simple, easy to implement and control and convenient to realize industrialization.

Description

Peep-proof membrane and preparation method thereof
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a peep-proof film and a preparation method thereof.
Background
Nowadays, electronic products such as computers, mobile phones and the like are integrated into the work and life of people, and provide much convenience for people. However, when people browse information through the screen of the electronic product, the browsed information is easily acquired by other people at two sides because the viewing angle of the screen is larger at present. Especially for some confidential information, the user of the electronic device does not want the information to be seen by others. The existing screen protection film does not have a peep-proof function, so that the confidentiality of screen information is poor.
At present, some thin films with peep-proof function, namely peep-proof films, exist in the market, the principle is that the optical technology of a superfine shutter is adopted, the content displayed on a screen is specially seen by a user in the front, the visual area is 60-90 degrees, and only a black painting picture can be seen by anyone in two side views. Effectively protecting commercial confidentiality and personal privacy, and enabling users to use electronic products such as computers, mobile phones and the like at will in offices, travels, public places and any environment.
However, the current peep-proof membrane structure is shown in fig. 1 a), the section of the peep-proof unit is trapezoidal, as shown in fig. 1 b), the section of the peep-proof unit is rectangular, as shown in fig. 1 c), and the section of the peep-proof unit is triangular; it can be seen that the peep-proof units of the existing peep-proof film are all linear edges, and the structure of the peep-proof film often has the following problems: 1) the linear edge structure of the privacy film structure is prone to form periodic stripes, so that moire phenomenon is prone to occur when the privacy film structure is matched with a display, as shown in fig. 2. 2) When the light-transmitting unit in the peep-proof film structure is a cuboid, the product has serious wire drawing phenomenon, and the appearance is influenced. 3) When the section of the light transmission unit in the peep-proof film structure is trapezoidal, the interfaces of the waist parts at two sides are easy to form total reflection, so that the light transmission rate is low, the viewing effect is influenced, and the experience of a user is influenced.
Disclosure of Invention
Aiming at the technical problems, the invention discloses an anti-peeping film and a preparation method thereof, which effectively solve the problems of poor screen definition caused by moire phenomenon, wire drawing phenomenon and low light transmittance of the anti-peeping film in the prior art.
In contrast, the technical scheme adopted by the invention is as follows:
a privacy film comprising a privacy base film and a light transmission treatment layer, the light transmission treatment layer being located over a surface of the privacy base film; the peep-proof base film comprises a base material layer, a plurality of peep-proof units and light transmission units are arranged on the base material layer, and the peep-proof units and the light transmission units are sequentially and alternately arranged to form a shutter structure; the light-transmitting treatment layer is a light-transmitting film layer containing transparent filler particles.
Adopt this technical scheme, set up printing opacity processing layer on the surface of peep-proof base film, contain transparent filler particle in the printing opacity processing layer, when the light that sees through peep-proof base film passes through printing opacity processing layer, light takes place reflection, refraction etc. behind meetting transparent filler particle, after the processing on printing opacity processing layer, has eliminated the visual mole line phenomenon of naked eye or has drawn the line phenomenon to the luminousness has been improved, makes the user have better experience and feels.
As a further improvement of the invention, the bottom of the section of the peep-proof unit is U-shaped or V-shaped, and the top of the light-transmitting unit is inverted U-shaped. Namely, the adjacent edges at the upper part of the light-transmitting unit are connected through an arc; the adjacent edges at the bottom of the peep-proof unit are connected through an arc. By adopting the technical scheme, the light transmittance is improved, the 180-degree peep-proof effect is realized, and the phenomena of white edges and the like formed by the conventional bonding edge with the screen are greatly reduced.
As a further improvement of the present invention, an included angle α between the sidewall of the peep-proof unit or the light-transmitting unit and a vertical plane of the substrate layer satisfies: alpha is less than 5 degrees and less than or equal to 18 degrees. Namely, the included angle between the side wall of the peep-proof unit or the light-transmitting unit and the substrate layer is greater than or equal to 72 degrees and less than 85 degrees. By adopting the technical scheme, the obtained peep-proof film has a better peep-proof effect at 180 degrees and high light transmittance.
As a further improvement of the invention, the ratio of the center distance between adjacent light-transmitting units to the height of the light-transmitting units is 1: 1.71-2.5. By adopting the technical scheme, the obtained peep-proof film has a better 180-degree peep-proof effect.
As a further improvement of the invention, the center distance between the adjacent light transmitting units or peep-proof units is 38 um-75 um.
As a further improvement of the invention, the height from the top of the light-transmitting unit to the surface of the base material layer is 65-115 um.
As a further improvement of the invention, the substrate layer is connected with the PET film or the PET hardened film through UV light curing glue or heat curing glue.
As a further improvement of the invention, the transparent filler particles are glass powder or acrylic powder. By adopting the technical scheme, the peep-proof film has a better 180-degree peep-proof effect, has high light transmittance, greatly weakens the phenomena of Moire lines and wiredrawing lines generated after the peep-proof film is adhered to a display screen, and has better experience. In addition, the glass powder or the acrylic powder can increase the hardness of the peep-proof film, improve the scratch resistance of the surface and have the extinction effect.
Further preferably, the transparent filler particles are glass frit. The glass powder generates micro-phase separation in the curing process of the system, so that the microstructure on the surface of the coating is rough and uneven, incident light forms diffuse reflection on the surface, people can not feel stronger reflected light in sense, the damage of the light source ray of the liquid crystal LED to eyes can be reduced to the maximum extent, and the fatigue, the dryness and the visual deterioration of the eyes can be prevented.
More preferably, the particle diameter of the transparent filler particles is 3 to 10 μm. By adopting the technical scheme, the phenomena of Moire lines and wiredrawing lines generated after the peep-proof film is adhered to the display screen are better eliminated, and the peep-proof film has better experience.
As a further improvement of the invention, the hardness of the light-transmitting treatment layer is 3H-9H. By adopting the technical scheme, the peep-proof film has certain hardness, has the effect similar to the stiffness of the existing mobile phone glass film, and also has certain flexibility, so that the film is convenient to stick.
As a further improvement of the present invention, the light-transmitting treated layer is cured or obtained by heating and/or UV curing using a mixture containing an optically light-transmitting resin and transparent filler particles. Further preferably, the optically transparent resin is an acrylic resin. By adopting the technical scheme, the preparation method is simple and easy to control.
As a further improvement of the invention, the light-transmitting treatment layer is a film layer formed by heating, mixing and processing optical resin and transparent filler particles.
As a further improvement of the present invention, the light transmission treatment layer is cured or obtained by heat curing and/or UV curing using a light transmission treatment material containing an acrylic resin, a photoinitiator, and transparent filler particles.
As a further improvement of the invention, the thickness of the light-transmitting treatment layer is 2-30 μm.
As a further improvement of the invention, the material proportion of the light-transmitting treatment layer is as follows: 10-65% of acrylate, 0.03-1.3% of photoinitiator, 0.1-1% of stabilizer, 0.5-2.5% of curing agent, 0.05-1% of defoaming agent, 10-40% of diluent, 10-45% of transparent filler particles and 10-35% of solvent.
In a further improvement of the invention, the acrylic resin is one or a mixture of two or more of methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate and hydroxyethyl methacrylate.
As a further improvement of the invention, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.
As a further improvement of the invention, the curing agent is one or a mixture of more than two of bicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyl diamino diphenylmethane and diacetone acrylamide.
As a further improvement of the invention, the stabilizer is hydroquinone.
As a further improvement of the invention, the diluent is one or a mixture of more than two of butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate and ethylene glycol ethyl ether.
As a further improvement of the invention, the solvent is one or a mixture of more than two of propylene glycol methyl ether, isopropyl acetate and acetone.
The invention also discloses a preparation method of the peep-proof membrane, which is characterized by comprising the following steps:
step S1, preparing a peep-proof basement membrane;
step S2, stirring and mixing the acrylate, the photoinitiator, the stabilizer, the curing agent, the defoamer, the diluent, the transparent filler particles and the solvent according to the proportion to obtain the polyacrylate coating;
step S3, coating the obtained polyacrylate coating on the surface of the peep-proof base film, and heating and curing and/or curing under ultraviolet light; or curing the polyacrylate coating to prepare a light-transmitting film, and then bonding the light-transmitting film with the peep-proof base film through the adhesive.
As a further improvement of the invention, in step S2, a heating curing and a curing under ultraviolet light are adopted, wherein the heating curing temperature is 90-110 ℃, the heating time is 2-5 min, and then the light-transmitting treatment layer is obtained through ultraviolet light curing.
The light-transmitting treatment layer adopts an acrylate system, and the structure of the system after curing has the advantages of high strength, high modulus, weather resistance and the like of acrylate adhesives. And the system has the advantages of good transparency, high hardness, uniform particle size distribution, good dispersibility, good intermiscibility with other components in a resin and paint system and the like with the added inorganic filler glass powder and acrylic powder in the curing process. Compared with talcum powder and silicon powder, the material is easy to precipitate in a mixed acrylic acid system, can increase the hardness and scratch resistance of a frosted layer, and has an extinction effect. The light-transmitting treatment layer has the matte effect, and also has the properties of preventing hand prints, preventing oil stains, facilitating cleaning and the like.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the technical scheme, the Moire pattern phenomenon and the wire drawing pattern phenomenon generated after the peep-proof film is attached to the display screen are eliminated, and the light transmittance is improved by 3-10%, so that the seen display screen has high definition and a better peep-proof effect; the preparation method is simple, easy to implement and control and convenient to realize industrialization.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art privacy film; a) the peep-proof unit is a trapezoidal peep-proof film, b) the peep-proof unit is a rectangular peep-proof film, and c) the peep-proof unit is a triangular peep-proof film.
Fig. 2 is an enlarged effect diagram of the surface of the peep-proof membrane in the prior art.
Fig. 3 is a schematic cross-sectional structure of the privacy film of the present invention.
Fig. 4 is a partially enlarged view of the privacy film of the present invention.
The reference numerals include:
1-peep-proof base film, 2-light-transmitting treatment layer, 11-base material layer, 12-peep-proof unit and 13-light-transmitting unit.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
As shown in fig. 3 and 4, a privacy film includes a privacy base film 1 and a light transmission treatment layer 2, the light transmission treatment layer 2 is located above the surface of the privacy base film 1; the peep-proof base film 1 comprises a base material layer 11, a plurality of peep-proof units 12 and light transmission units 13 are arranged on the base material layer 11, and the peep-proof units 12 and the light transmission units 13 are sequentially and alternately arranged to form a louver structure; the light-transmitting treatment layer 2 is a light-transmitting film layer containing transparent filler particles.
Specifically, the bottom of the cross section of the peep-proof unit 12 is U-shaped, and the top of the light-transmitting unit 13 is inverted U-shaped. Namely, the adjacent edges at the upper part of the light-transmitting unit 13 are connected through an arc; the adjacent edges at the bottom of the peep-proof unit 12 are connected through an arc. The included angle alpha between the side wall of the peep-proof unit 12 or the light-transmitting unit 13 and the vertical surface of the substrate layer 11 satisfies the following requirements: alpha is less than 5 degrees and less than or equal to 18 degrees. Namely, the included angle between the sidewall of the peep-proof unit 12 or the light-transmitting unit 13 and the substrate layer 11 is greater than or equal to 72 degrees and less than 85 degrees. If the included angle between the side wall of the peep-proof unit 12 or the light-transmitting unit 13 and the vertical plane of the substrate layer 11 is less than 5 degrees, the product is easy to generate a wire drawing phenomenon. When the angle is more than 18 degrees, the interfaces of the waist parts at two sides are easy to form total reflection, so that the light transmittance is low, and the viewing effect is influenced.
The ratio of the center distance A between the adjacent light transmitting units 13 to the height B of the light transmitting units 13 is 1: 1.71-2.5.
Further, the center distance between the adjacent light transmitting units 13 or the peep-proof units 12 is 38 um-75 um. The top of printing opacity unit 13 is 65um ~115um apart from the height on substrate layer 11 surface.
The light-transmitting treatment layer is obtained by adopting a light-transmitting treatment material containing acrylic resin, a photoinitiator and transparent filler particles through UV curing or heating curing. The thickness of the light-transmitting treatment layer is 2-30 mu m. The material ratio of the light-transmitting treatment layer is as follows: 10-65% of acrylate, 0.03-1.3% of photoinitiator, 0.1-1% of stabilizer, 0.5-2.5% of curing agent, 0.05-1% of defoaming agent, 10-40% of diluent, 10-45% of transparent filler particles and 10-35% of solvent. Further, the acrylic resin is one or a mixture of more than two of methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate and hydroxyethyl methacrylate. The photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-acetone. The curing agent is one or a mixture of more than two of bicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyl diamino diphenylmethane and diacetone acrylamide. The stabilizer is hydroquinone. The diluent is one or a mixture of more than two of butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate and ethylene glycol ethyl ether. The solvent is one or a mixture of more than two of propylene glycol methyl ether, isopropyl acetate and acetone. The transparent filler particles are glass powder or acrylic powder, and the particle size of the transparent filler particles is 3-10 mu m.
The preparation method of the peep-proof film comprises the following steps:
step S1, preparing a peep-proof basement membrane;
step S2, stirring and mixing the acrylate, the photoinitiator, the stabilizer, the curing agent, the defoamer, the diluent, the transparent filler particles and the solvent according to the proportion to obtain the polyacrylate coating;
step S3, coating the obtained polyacrylate coating on the surface of the peep-proof base film, and heating and curing and/or curing under ultraviolet light; or curing the polyacrylate coating to prepare a light-transmitting film, and then bonding the light-transmitting film with the peep-proof base film through the adhesive.
Further, in step S2, a heating curing mode and a ultraviolet curing mode are adopted, wherein the heating curing temperature is 90-110 ℃, the heating time is 2-5 min, and then the light-transmitting treatment layer is obtained through ultraviolet curing.
The following description is directed to specific preferred embodiments.
Example 1
The peep-proof film is prepared according to the steps of the specific embodiment, in the embodiment, the material ratio of the light-transmitting treatment layer is as follows: 55% of methyl methacrylate, 1.3% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.5% of hydroquinone, 2.0% of bicyclic amidine, 1.2% of defoaming agent, 15% of butanediol diglycidyl ether, 5-15% of glass powder and 15% of acetone. The grain size of the glass powder is 1-2 μm.
Through testing, the peep-proof film of the embodiment is attached to a mobile phone screen, the phenomenon of moire or wiredrawing can still be seen by naked eyes, the peep-proof visual angle is 37 degrees, the light transmittance is 63%, and the surface hardness is more than or equal to 2H.
Example 2
The peep-proof film is prepared according to the steps of the specific embodiment, in the embodiment, the material ratio of the light-transmitting treatment layer is as follows: 45% of ethyl methacrylate, 1.3% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.3% of hydroquinone, 1.3% of hexahydrophthalic anhydride, 0.1% of defoaming agent, 10% of ethylene glycol ethyl ether, 20-35% of glass powder and 10% of propylene glycol methyl ether. The grain diameter of the glass powder is 3-10 μm.
Through testing, the peep-proof film of the embodiment is attached to a mobile phone screen, the phenomenon of moire or wiredrawing cannot be seen by naked eyes, the peep-proof visual angle is 33 degrees, the light transmittance is 67%, and the surface hardness is more than or equal to 3H.
Example 3
The peep-proof film is prepared according to the steps of the specific embodiment, in the embodiment, the material ratio of the light-transmitting treatment layer is as follows: 45% of ethyl methacrylate, 1.3% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.3% of hydroquinone, 1.3% of hexahydrophthalic anhydride, 0.1% of defoaming agent, 10% of ethylene glycol ethyl ether, 20-35% of glass powder and 10% of propylene glycol methyl ether. The grain diameter of the glass powder is 10-15 μm.
Through testing, the peep-proof film of the embodiment is attached to a mobile phone screen, the phenomenon of moire or wiredrawing can not be seen by naked eyes, the peep-proof visual angle is 33 degrees, the light transmittance is 57%, the surface hardness is not less than 3H, and the screen definition is reduced due to the overlarge phenomena of diffuse reflection and refraction.
Example 4
The peep-proof film is prepared according to the steps of the specific embodiment, in the embodiment, the material ratio of the light-transmitting treatment layer is as follows: 55% of methyl methacrylate, 0.05% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.15% of hydroquinone, 1.8% of phthalic anhydride, 1% of defoaming agent, 20% of butyl methacrylate, 15% of acrylic powder and 10% of acetone. The grain diameter of the acrylic powder is 1-2 μm.
Through testing, the peep-proof film of the embodiment is attached to a mobile phone screen, so that the phenomena of weak Moire lines or wiredrawing lines can be still seen by naked eyes, the peep-proof visual angle is 37 degrees, the light transmittance is 55%, and the surface hardness is more than or equal to 1H.
Example 5
The peep-proof film is prepared according to the steps of the specific embodiment, in the embodiment, the material ratio of the light-transmitting treatment layer is as follows: 45% of methyl methacrylate, 0.05% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.15% of hydroquinone, 1.8% of phthalic anhydride, 1% of defoaming agent, 20% of butyl methacrylate, 15-25% of acrylic powder and 10% of acetone. The grain diameter of the acrylic powder is 3-10 μm.
Through testing, the peep-proof film of the embodiment is attached to a mobile phone screen, the phenomenon of moire or wiredrawing cannot be seen by naked eyes, the peep-proof visual angle is 35 degrees, the light transmittance is 52%, and the surface hardness is more than or equal to 2H.
Comparative example 1
In addition to example 1, in this comparative example, the particle size of talc powder used was 1 to 15 μm, and the other examples were the same as those of the example.
Through tests, the peep-proof film of the comparative example is attached to a mobile phone screen, the phenomenon of weak Moire lines or wire drawing lines can still be seen by naked eyes, and compared with the peep-proof film of the example 1, the peep-proof visual angle is increased by 3-5%, the light transmittance is reduced by 5-15%, the surface hardness is not less than 1H, and the screen definition is reduced by 10-30%.
Comparative example 2
A privacy film was prepared according to the preparation method of example 1. In this embodiment, the material ratio of the light-transmitting treatment layer is: 70% of methyl methacrylate, 1.3% of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.5% of hydroquinone, 2.5% of bicyclic amidine, 0.7% of defoaming agent, 10% of butanediol diglycidyl ether, 10-35% of other inorganic substances and 10% of acetone.
Through testing, the peep-proof film of the comparative example is attached to a mobile phone screen, the phenomenon of weak moire or wiredrawing can still be seen by naked eyes, compared with the embodiment 1, the peep-proof visual angle is increased by 3-10%, the light transmittance is reduced by 10-25%, the surface hardness is not less than 1H, the screen definition is obviously reduced, and the experience effect is poor.
As can be seen from the comparison between the embodiment and the comparative example, the technical scheme of the invention has better peep-proof effect, can better eliminate Moire and wire drawing phenomena, has high light transmittance and better experience.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (9)

1. A privacy film characterized by: the anti-peeping base film comprises an anti-peeping base film and a light transmission treatment layer, wherein the light transmission treatment layer is positioned above the surface of the anti-peeping base film; the peep-proof base film comprises a base material layer, a plurality of peep-proof units and light transmission units are arranged on the base material layer, and the peep-proof units and the light transmission units are sequentially and alternately arranged to form a shutter structure; the light-transmitting treatment layer is a light-transmitting film layer containing transparent filler particles;
the material ratio of the light-transmitting treatment layer is as follows: 10-65% of acrylic resin, 0.03-1.3% of photoinitiator, 0.1-1% of stabilizer, 0.5-2.5% of curing agent, 0.05-1% of defoaming agent, 10-40% of diluent, 10-45% of transparent filler particles and 10-35% of solvent; the particle diameter of the transparent filler particles is 3-10 μm.
2. The privacy film of claim 1, wherein: the bottom of the section of the peep-proof unit is U-shaped or V-shaped, the top of the light-transmitting unit is inverted U-shaped, and the included angle alpha between the side wall of the peep-proof unit or the light-transmitting unit and the vertical surface of the base material layer satisfies the following requirements: alpha is less than 5 degrees and less than or equal to 18 degrees.
3. The privacy film of claim 2, wherein: the ratio of the center distance between the adjacent light transmitting units to the height of the light transmitting units is 1: 1.71-2.5.
4. The privacy film of claim 3, wherein: the center distance between the adjacent light transmitting units or peep-proof units is 38-75 mu m; the height from the top of the light-transmitting unit to the surface of the base material layer is 65-115 mu m.
5. The privacy film of claim 1, wherein: the hardness of the light-transmitting treatment layer is 3H-9H.
6. The privacy film of any one of claims 1-5, wherein: the transparent filler particles are glass powder or acrylic powder;
the light-transmitting treatment layer is obtained by heating and/or UV curing a mixture containing optical light-transmitting resin and transparent filler particles.
7. The privacy film of claim 6, wherein: the light-transmitting treatment layer is obtained by heating and/or UV curing a light-transmitting treatment material containing acrylic resin, a photoinitiator and transparent filler particles, and the thickness of the light-transmitting treatment layer is 2-30 mu m.
8. The privacy film of claim 7, wherein: the acrylic resin is one or a mixture of more than two of methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate and hydroxyethyl methacrylate;
the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-acetone; the curing agent is one or a mixture of more than two of bicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyl diamino diphenylmethane and diacetone acrylamide; the stabilizer is hydroquinone; the diluent is one or a mixture of more than two of butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate and ethylene glycol ethyl ether; the solvent is one or a mixture of more than two of propylene glycol methyl ether, isopropyl acetate and acetone.
9. The method for preparing a privacy film according to claim 7 or 8, comprising:
step S1, preparing a peep-proof basement membrane;
step S2, stirring and mixing acrylic resin, a photoinitiator, a stabilizer, a curing agent, a defoaming agent, a diluent, transparent filler particles and a solvent according to a ratio to obtain a polyacrylate coating; step S3, coating the obtained polyacrylate coating on the surface of the peep-proof base film, and heating and curing and/or curing under ultraviolet light; or curing the polyacrylate coating to prepare a light-transmitting film, and then bonding the light-transmitting film with the peep-proof base film through the adhesive.
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CN113150713A (en) * 2021-05-24 2021-07-23 宁波长阳科技股份有限公司 Peep-proof film
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CN103818076B (en) * 2014-02-25 2015-09-23 苏州城邦达力材料科技有限公司 A kind of peep-proof film
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